Integrated auto-level and electronic rod reader

ABSTRACT

An integrated auto-level and electronic rod reader is disclosed. In one embodiment, the integrated auto-level and electronic rod reader comprises a telescope and an image delivery device integrated with the auto-level which is configured for capturing an image of a standard grade rod visible through the telescope and a crosshair. Logic implemented by a processor automatically recognizes the crosshair, automatically compares the crosshair against a scale of the standard grade rod, and automatically determines an elevation of the standard grade rod based upon the comparing.

BACKGROUND

An automatic level, or “auto-level” is an optical instrument used inconstruction and surveying tasks. In use, the device is approximatelyleveled using three legs. Once the device is approximately level, theoptics are self-leveling in that they are hung like a pendulum withinthe device. An assistant moves to various locations at a site with agrade rod having a scale printed on it and the operator of theauto-level reads the scale through the eyepiece of the auto-level. Thenumber on the scale is subtracted from the known elevation of theauto-level to determine the elevation at the point where the grade rodis located. The auto-level is used to manage elevations, move elevationsfor construction and earthmoving projects, and to determine elevationsfor cuts and fills at construction sites.

The use of auto-levels is problematic in there can be some error inreading the scales printed on the grade rods. More specifically, notevery line on the scale of the grade rod is dimensioned so there is somedegree of operator skill needed to properly determine the elevation ofthe location at which the grade rod is located. Furthermore, thereadings from the auto-level are entered into a field-book which liststhe location and elevations read using the auto-level. In someinstances, math errors have resulted in incorrect readings beingrecorded in the field-book. The field-books are retained both for theproject at hand as well as to verify that the readings were and made andother legal reasons. However, reading the field-book by variousoperators is not always error free both in reading the notes associatedwith the elevations, but the actual dimensions recorded using theauto-level. As more than one worker may be operating the auto-level onvarious days of a project, it can be difficult for everyone working onthe project to derive the same information from reading the field-book.Additionally, the operator of the auto-level is in communication withassistant holding the grade rod. The assistant frequently plants stakesin the ground where the reading was taken having information such as,“Cut 2 meters,” printed on the stake. Equipment operators at the sitewill then perform earthmoving operations in accordance with theinstructions printed on the stake. However, in some instancescommunications between the operator of the auto-level and the assistantat the grade rod are impeded and incorrect instructions are then printedon the stake.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and form a part ofthis application, illustrate embodiments of the subject matter, andtogether with the description of embodiments, serve to explain theprinciples of the embodiments of the subject matter. Unless noted, thedrawings referred to in this brief description of drawings should beunderstood as not being drawn to scale. Herein, like items are labeledwith like item numbers.

FIG. 1 shows an example use of an electronic rod reader and fieldnotebook in accordance with various embodiments.

FIG. 2 depicts a block diagram of an example electronic rod reader andfield notebook in accordance with at least one embodiment.

FIG. 3 is a diagram of components of an example electronic rod readerand field notebook logic component in accordance with variousembodiments.

FIG. 4 shows an image captured by an image capture device of anelectronic rod reader and field notebook in accordance with variousembodiments.

FIG. 5 is a flowchart of a method of automatically reading and recordingauto-level readings in accordance with various embodiments.

FIG. 6 is a cross-sectional view of an example auto-level in accordancewith various embodiments.

FIG. 7 is a cross-sectional view of an example auto-level in accordancewith various embodiments.

FIG. 8 is a cross-sectional view of an example auto-level in accordancewith various embodiments.

FIG. 9 is a block diagram of an example image capture device inaccordance with various embodiments.

FIG. 10 is a cross-sectional view of an example auto-level in accordancewith various embodiments.

FIG. 11 is a flowchart of a method of automatically reading andrecording auto-level readings in accordance with various embodiments.

DESCRIPTION OF EMBODIMENTS

Reference will now be made in detail to various embodiments of thesubject matter, examples of which are illustrated in the accompanyingdrawings. While various embodiments are discussed herein, it will beunderstood that they are not intended to limit to these embodiments. Onthe contrary, the presented embodiments are intended to coveralternatives, modifications and equivalents, which may be includedwithin the spirit and scope the various embodiments as defined by theappended claims. Furthermore, in the following Description ofEmbodiments, numerous specific details are set forth in order to providea thorough understanding of embodiments of the present subject matter.However, embodiments may be practiced without these specific details. Inother instances, well known methods, procedures, components, andcircuits have not been described in detail as not to unnecessarilyobscure aspects of the described embodiments.

Unless specifically stated otherwise as apparent from the followingdiscussions, it is appreciated that throughout the description ofembodiments, discussions utilizing terms such as “capturing,”“recognizing,” “comparing,” “determining,” “storing,” “using,” “receivin” g, “conveying,” and “estimating” to transform the state of a computersystem,” or the like, refer to the actions and processes of a computersystem, data storage system, storage system controller, microcontroller,hardware processor, or similar electronic computing device orcombination of such electronic computing devices. The computer system orsimilar electronic computing device manipulates and transforms datarepresented as physical (electronic) quantities within the computersystem's/device's registers and memories into other data similarlyrepresented as physical quantities within the computer system's/device'smemories or registers or other such information storage, transmission,or display devices.

FIG. 1 shows an example use of an electronic rod reader and fieldnotebook in accordance with various embodiments. In FIG. 1, anauto-level 101 comprising an eyepiece 102 is set up to allow view of thestandard grade rod 110 through the eyepiece 102. It should beappreciated that the term “standard grade rod” as used herein issynonymous and interchangeably usable with the term “grade rod,” theterm “grading rod,” or the term “leveling rod.” Typically, standardgrade rod 110 is first set over a point (e.g., point 105) having a knownelevation (i.e., a “benchmark” elevation). A reading that is typicallycalled a “backsight” is taken by reading the standard grade rod 110through eyepiece 102 when standard grade rod 110 it is positioned overthe first set point. The reading of standard grade rod 110 is then addedto the known elevation of point 105, and the height of auto-level 101(e.g., the elevation of the crosshair viewed when looking though theeyepiece) above the ground is then known. The elevation of a newlocation can be determined by putting standard grade rod 110 at the newlocation, looking through eyepiece 102, and reading the scale printed onstandard grade rod 110. That value is then subtracted from the height ofauto-level 101 and the elevation of the new location is known. If adesired elevation is known, the difference between the elevation of thepoint just measured and the desired elevation can be calculated for acut/fill operation. For the purposes of the present application, theterm “standard grade rod” is intended to mean a grade rod not havingspecial characters which can only be read by a computer. In other words,a standard grade rod (e.g., standard grade rod 110) has characters andmarkings which can be read by a human as is the case with most graderods currently in use.

Also shown in FIG. 1 is electronic rod reader and field notebook 120which is used in various embodiments to read standard grade rod 110 andto record the elevation data, as well as other pertinent data. Inaccordance with various embodiments, electronic rod reader and fieldnotebook 120 is configured to automatically recognize a crosshair viewedthrough eyepiece 102 and to automatically compare that crosshair againstthe scale displayed on standard grade rod 110. In other words,electronic rod reader and field notebook 120 automatically determineswhich mark of the scale displayed on standard grade rod 110 is mostclosely aligned with the crosshairs displayed in eyepiece 102.Electronic rod reader and field notebook 120 is further configured torecognize the characters printed on standard grade rod 110 and to usethis information to automatically determine a dimension which issubtracted from the known elevation of auto-level 101 to determine anelevation of the location at which standard grade rod 110 is located.For example, if the elevation of auto-level 101 is 100 meters, and thedimension read off of standard grade rod 110 is 2 meters, electronic rodreader and field notebook 120 can determine that the elevation of thelocation at which standard grade rod 110 is located is 98 meters. Inaccordance with various embodiments, electronic rod reader and fieldnotebook 120 is configured to automatically store this data in anon-volatile data storage device.

As will be described in greater detail below, electronic rod reader andfield notebook 120 can be a dedicated device configured to read thedimensions off of standard grade rod 110 through eyepiece 102. Inaccordance with at least one embodiment, electronic rod reader and fieldnotebook 120 comprises a portable electronic device which is notoriginally configured to be used as a surveying device, or to performthe operations described above. For example, in accordance with at leastone embodiment, electronic rod reader and field notebook 120 comprises acellular telephone which has been configured to perform the abovedescribed operations using logic implemented by a processor ofelectronic rod reader and field notebook 120. In accordance with variousembodiments, electronic rod reader and field notebook 120 comprises awireless communication device which can be used, for example, tocommunicate with a device operated by the assistant who is holdingstandard grade rod 110. Thus, an operator of electronic rod reader andfield notebook 120 can send messages to the assistant using standardgrade rod 110 with instructions such as what message to write on a staketo be placed at the location at which standard grade rod 110 iscurrently located (e.g., “Cut 2 meters”). Furthermore, if the assistantusing standard grade rod 110 has an electronic device configured with aGlobal Navigation Satellite System (GNSS) receiver, the assistant cansend the geographic coordinates of the location at which standard graderod 110 is located to electronic rod reader and field notebook 120. Thisinformation can be stored along with the elevation information derivedby electronic rod reader and field notebook 120. Additionally, theassistant using standard grade rod 110 can send photos to electronic rodreader and field notebook 120 of the location at which various readingwere made to create a more complete, and more accurate, record of thelocations at which reading were made. This removes some of the ambiguitypreviously associated with manually entered data which comprisedfield-books. For example, previously, notes appended to readings mightindicate that the grade rod is located at the North-west corner of abuilding. This ambiguity can be problematic when trying to recreate themeasurements later. However, adding photographs to the data file beingrecorded by electronic rod reader and field notebook 120 facilitatesmore clearly conveying exactly where measurements were taken, as well asother information in the notes which could be mis-interpreted.

FIG. 2 depicts a block diagram of an example electronic rod reader andfield notebook 120 in accordance with at least one embodiment. Examplesof an electronic rod reader and field notebook 120 as shown in FIG. 2comprise a non-voice enabled cellular device such as a positionrecording/reporting device, or a standard cellular telephone. Theelectronic rod reader and field notebook 120 includes a bus 201, a GNSSchipset 202 coupled with bus 201, a processor 203 coupled with bus 201for processing information and instructions, a memory 204 coupled withbus 201 for storing information and instructions for processor 203. Itis noted that memory 204 can comprise volatile memory and non-volatilememory, as well as removable data storage media in accordance withvarious embodiments. Examples of instructions are computer readableinstructions for implementing an embodiment of electronic rod reader andfield notebook logic component 220 that can be stored on a hardwarememory 204 and that can be executed, for example, by the hardwareprocessor 203. Other components of electronic rod reader and fieldnotebook 120 comprise an accelerometer 205 coupled with bus 201, and animage capture device 206 coupled with bus 201.

In FIG. 2, electronic rod reader and field notebook 120 furthercomprises an image capture device 206 and a cellular transceiver 207coupled with bus 201. Examples of image capture device 206 are a camera,a video camera, a digital camera, a digital video camera, a digitalcamcorder, a stereo digital camera, a stereo video camera, and a motionpicture camera. The image capture device 206 may use a lens or be apinhole type device.

According to various embodiments, cellular transceiver 207 is configuredto permit communication via a cellular telephone network. Examples ofcellular networks used by cellular transceiver 207 include, but are notlimited to: GSM (Global System for Mobile Communications) cellularnetworks, GPRS (General Packet Radio Service) cellular networks, CDMA(Code Division Multiple Access) cellular networks, LTE (Long-TermEvolution), and EDGE (Enhanced Data rates for GSM Evolution) cellularnetworks, to name several. In accordance with at least one embodiment,cellular transceiver 207 is configured to operate on a satellite-basedcellular network such as the Inmarsat or Iridium communication networks.In at least one embodiment, electronic rod reader and field notebook 120is configured to receive GNSS corrections via a cellular network whichare received by cellular transceiver 207. Similarly, using cellulartransceiver 207, electronic rod reader and field notebook 120 can sendor receive position data including position fixes to other deviceseither located proximate to electronic rod reader and field notebook 120or at a distant location.

In the embodiment of FIG. 2, electronic rod reader and field notebook120 further comprises a display 208. In accordance with variousembodiments, display 208 comprises a touch screen display usingcapacitive or resistive sensors to determine the location of an objecttouching the screen and which can be interpreted as inputs forcontrolling operations by processor 203. In accordance with variousembodiments, optional Wi-Fi transceiver 209 may be configured to operateon/in compliance with any suitable wireless communication protocolincluding, but not limited to: Wi-Fi, WiMAX, implementations of the IEEE802.11 specification, implementations of the IEEE 802.15.4 specificationfor personal area networks, and a short range wireless connectionoperating in the Instrument Scientific and Medical (ISM) band of theradio frequency spectrum in the 2400-2484 MHz range (e.g.,implementations of the Bluetooth® standard).

Typically, global navigation satellites (not shown) provide radionavigation signals used by GNSS chipset 202 to determine the position ofexample electronic rod reader and field notebook 120. It is noted thatthe term “GNSS” refers to a variety of satellite navigation systemsemployed worldwide including, but not limited to, the Global PositioningSystem (GPS), the Globalnaya navigatsionnaya sputnikovaya sistema(GLONASS), the GALILEO satellite system, the BeiDou navigation satellitesystem, the Compass navigation satellite system, the Indian RegionNavigation Satellite System (IRNSS), the Quasi-Zenith Satellite System(QZSS) navigation satellite system, or other implementations. Accordingto one embodiment, the GNSS chipset 202 is configured to receive signalsfrom GPS satellites, GLONASS satellites, Galileo satellites, or from acombination of satellites from different constellations of GNSSsatellites. The GNSS chipset 202 can perform, for example, GPSmeasurements to derive raw measurement data for a position of theelectronic rod reader and field notebook 120. The raw measurement datacan provide an instant location (e.g., position fix) of the electronicrod reader and field notebook 120 which is output from GNSS chipset 202.

In accordance with one embodiment, GNSS chipset 202 comprises a low-costchipset used by electronic rod reader and field notebook 120 whichsimply outputs a position fix of electronic rod reader and fieldnotebook 120 based upon unsmoothed pseudoranges. In other words, in theinterest of reducing costs, various features for improving the positionfix are typically not built into a low-cost GNSS chipset such as GNSSchipset 202 including, but not limited to, pseudorange smoothing,carrier phase smoothing (e.g., based upon real carrier phaseinformation, reconstructed carrier phase information). Alternatively,GNSS chipset 202 may incorporate features which facilitate determining aposition fix of electronic rod reader and field notebook 120 withgreater precision. For example, GNSS chipset 202 can comprise a WideArea Augmentation System (WAAS) enabled receiver configured to receivebroadcast WAAS corrections which can be used to improve the precision indetermining the position of electronic rod reader and field notebook120.

Improvements in GNSS positioning may be obtained by using referencestations with a fixed receiver system to calculate corrections to themeasured pseudoranges in a given geographical region. Since thereference station is located in a fixed environment and its location canbe determined very precisely via ordinary survey methods, a processorassociated with the reference station GNSS receivers can determine moreprecisely what the true pseudoranges should be to each satellite inview, based on geometrical considerations. For example, knowing theorbital positions of GPS satellites via the GPS almanac as a function oftime enables this process with GPS positioning, first proposed in 1983,and widely adopted ever since. The difference between the observedpseudorange and the calculated pseudorange for a given reference stationis called the pseudorange correction. A set of corrections for all theglobal navigation satellites in view is created second by second, andstored, and made available as a service, utilizing GNSS referencestations and correction services. The pseudoranges at both theelectronic rod reader and field notebook 120 (e.g., GNSS chipset 202),and those at the reference stations are time-tagged, so the correctionsfor each and every pseudorange measurement can be matched to the localcell phone pseudoranges. With respect to a GPS implementation, theoverall service is often referred to as Differential GPS, or DGPS.Again, with respect to a GPS implementation, without any corrections,GNSS receivers produce position fixes with absolute errors in positionon the order of 4.5 m to 5.5 m per the GPS SPS Performance Standard, 4thEd. 2008. In FIG. 2, one or more correction services convey thesecorrections via a cellular network, or the Internet. The Internet is inturn coupled with a local Wi-Fi network which can convey the correctionsto electronic rod reader and field notebook 120 via Wi-Fi transceiver209. Alternatively, a cellular network (not shown) can convey thecorrections to electronic rod reader and field notebook 120 via cellulartransceiver 207.

In accordance with various embodiments, a plurality of broadcast sourcesis used to convey data and media to electronic rod reader and fieldnotebook 120. As an example, electronic rod reader and field notebook120 can receive broadcast signals from communication satellites (e.g.,two-way radio, satellite-based cellular such as the Inmarsat or Iridiumcommunication networks, etc.) and global navigation satellites whichprovide radio navigation signals (e.g., the GPS, GNSS, GLONASS, GALILEO,BeiDou, Compass, etc.). In some embodiments, correction services arealso coupled with a distribution service which conveys the correctionsto a satellite radio distributor. The satellite radio distributor canbroadcast corrections as a broadcast from one or more communicationssatellites. In some embodiments, electronic rod reader and fieldnotebook 120 includes one or more integral satellite radio antennasassociated with optional integrated satellite radio receiver(s) 210.Satellite radio receiver 210 is one example of such a satellite receiverwhich would employ an integrated antenna designed to operate in thecorrect frequency band for receiving a corrections or other informationbroadcast from communication satellites. In this manner, in someembodiments, electronic rod reader and field notebook 120 can receivethe corrections via satellite radio receiver 210.

The blocks that represent features in FIG. 2 can be arranged differentlythan as illustrated, and can implement additional or fewer features thanwhat are described herein. Further, the features represented by theblocks in FIG. 2 can be combined in various ways. Electronic rod readerand field notebook 120 can be implemented using software, hardware,hardware and software, hardware and firmware, or a combination thereof.Further, unless specified otherwise, various embodiments that aredescribed as being a part of the electronic rod reader and fieldnotebook 120, whether depicted as a part of the electronic rod readerand field notebook 120 or not, can be implemented using software,hardware, hardware and software, hardware and firmware, software andfirmware, or a combination thereof. Various blocks in FIG. 2 refer tofeatures that are logic, such as but not limited to electronic rodreader and field notebook logic component 220 can be implemented usingsoftware, hardware, hardware and software, hardware and firmware,software and firmware, or a combination thereof.

FIG. 3 is a diagram of components of an example electronic rod readerand field notebook logic component 220 in accordance with variousembodiments. In FIG. 3, electronic rod reader and field notebook logiccomponent 220 comprises a crosshair recognition component 301. Inaccordance with various embodiments, electronic rod reader and fieldnotebook 120 is configured to automatically recognize the crosshairsviewed through the eyepiece of an auto-level. In the present example,crosshair recognition component 301 is configured to recognize at leastone (e.g., a horizontal crosshair 401 of FIG. 4) and, in someembodiments, two (e.g., horizontal crosshair 401 and vertical crosshair402 of FIG. 4) crosshairs viewed through eyepiece 102 of auto-level 101.In FIG. 3, electronic rod reader and field notebook logic component 220further comprises a scale detection component 302. In accordance withvarious embodiments, scale detection component 302 is configured toautomatically recognize the markings of a scale displayed on standardgrade rod 110. With reference again to FIG. 4, a plurality of hash marks413 or bars are shown displayed on standard grade rod 110. Dependingupon which type of standard grade rod is used, these hash marks 413represent different distances. For example, a 10ths of a foot roddisplays feet starting from zero and the hash marks 413 indicated 10thsof a foot, 100ths of a foot, etc. In the example of FIG. 4, it is notedthat the width of each hash mark 413 is identical to the width of thespace between hash marks 413. This makes it easier to determinefractions of an inch using auto-level 101. Another type of standardgrade rod is shown in FIG. 4 and is known as a ⅛^(th) inch rod. In thistype of rod, feet starting from zero are shown as well as inches, and⅛ths of an inch. Again, the width of each hash mark 413 is identical tothe width of the space between hash marks 413. In the example of FIG. 4,the foot number (e.g., 410 in FIG. 4) indicates the 4 foot mark. Theinch number (e.g., 411 of FIG. 4) indicates the two inch mark, or morespecifically, a point 4 feet and 2 inches above the ground when the tipof standard grade rod 110 is placed at a location. Another type ofstandard grade rod is a metric grade rod which has markings for meters,decimeters, centimeters, etc.

In FIG. 3, electronic rod reader and field notebook logic component 220further comprises a scale comparison component 303. In accordance withvarious embodiments, scale comparison component 303 is configured tocompare horizontal crosshair 401 with the scale displayed on standardgrade rod 110 by image capture device 206. In other words, scalecomparison component 303 “reads” the value of the scale displayed onstandard grade rod 110 by determining which value of the scale isco-planar with horizontal crosshair 401. In FIG. 3, electronic rodreader and field notebook logic component 220 further comprises a scaleidentification component 304. In accordance with various embodiments,scale identification component 304 automatically determines the scaledisplayed on standard grade rod 110. For example, the markings displayedon standard grade rod 110 are different depending upon which type ofgrade rod (e.g., metric, 1/10th of a foot rod, ⅛th of an inch rod, etc.)is being used. This is possible because the characters and hash marks413 displayed on the rod will be different for each type of rod. In theexample of FIG. 4, standard grade rod 110 displays characters 412 whichindicate that the inch hash marks 413, and numbers proximate to them,are within the 4 foot range. This is necessary because the narrow fieldof view through auto-level 101 would obscure that information from aviewer for certain values displayed on the rod. Thus, the characters 412are displayed so that a user can easily determine what value is beingdisplayed. Similarly, a metric rod may have characters 412 whichindicate meters and decimeters to facilitate reading values fromstandard grade rod 110. In accordance with various embodiments,character recognition component 309 can identify that some type ofstandard grade rod 110 is being used which uses feet or meters basedupon the characters 412 that are read. Additionally, the pattern of hashmarks 413 is different for a ⅛^(th) inch rod than the pattern for a1/10^(th) foot rod or a metric rod. In accordance with variousembodiments, scale identification component 304 can also recognize thepattern of hash marks 413 to facilitate automatically determining thetype of standard grade rod 110 being used. Additionally, scaleidentification component 304 can utilize manually entered data whichidentifies the type of standard grade rod 110 being used.

In FIG. 3, electronic rod reader and field notebook logic component 220further comprises a dimension identifier component 305. In accordancewith various embodiments, dimension identifier component 305 completesthe process of “reading” standard grade rod 110 using informationreceived from scale comparison component 303 and scale identificationcomponent 304. In other words, scale comparison component 303 providesinformation as to which hash mark 413 is co-planar with horizontalcrosshair 401 and scale identification component 304 providesinformation as to which type (e.g., metric, 1/10^(th) foot, ⅛^(th) inch,etc.) of standard grade rod 110 is being used. With this information,dimension identifier component 305 can make a reading of the dimensionbeing read by auto-level 101. For example, in FIG. 4, horizontalcrosshair 401 is co-planar with a hash mark 413 which indicates adimension of 4 feet, 2 and ⅝^(ths) inches. This value is subtracted fromthe known elevation of auto-level 101. In FIG. 3, electronic rod readerand field notebook logic component 220 further comprises an elevationaccessor component 306. In accordance with various embodiments,elevation accessor component 306 is configured to provide the elevationof point 105 at which standard grade rod 110 is set up. In accordancewith various embodiments, elevation accessor component 306 comprises adatabase 306A of known benchmarks and their elevations. A user canmanually enter the identifier of a particular benchmark and elevationaccessor component 306 can automatically provide the elevation at thatparticular benchmark by looking up the corresponding elevation indatabase 306A. In accordance with various embodiments, elevationaccessor component 306 can download the database prior to deployingauto-level 101 in the field. For example, a user can enter a location orjob-site at which auto-level 101 is to be deployed and a set ofbenchmarks, and their corresponding elevations, proximate to that areawill be automatically selected and downloaded into database 306A. Inaccordance with another embodiment, elevation accessor component 306 canaccess a position fix from GNSS chipset of the location at whichauto-level 101 is currently located and perform a similar operationusing, for example, cellular transceiver 207, or Wi-Fi transceiver 209.In another embodiment, elevation accessor component 306 can accessmanually entered data which specifies the elevation of the point 105 atwhich standard grade rod 110 is located.

In FIG. 3, electronic rod reader and field notebook logic component 220further comprises an elevation determination component 307. Inaccordance with various embodiments, elevation determination component307 performs the subtraction of the dimension determined by dimensionidentifier component 305 with the elevation of auto-level 101 todetermine the reading of elevation when standard grade rod 110 is placedat a location and read by auto-level 101. In FIG. 3, electronic rodreader and field notebook logic component 220 further comprises aposition receiver component 308. In accordance with various embodiments,position receiver component 308 is configured to receive a position fixfrom a GNSS equipped device located at the position of standard graderod 110. Using this information, electronic rod reader and fieldnotebook logic component 220 can create a complete record of locationand elevation of each point at which standard grade rod 110 is readusing auto-level 101. In FIG. 3, electronic rod reader and fieldnotebook logic component 220 further comprises an image pixel comparatorcomponent 310. In accordance with various embodiments, image pixelcomparator component 310 is configured to estimate a value whenhorizontal crosshair 401 is determined to be aligned between two hashmarks 413. In other words, when horizontal crosshair 401 does notexactly lie upon an edge of one of hash marks 413, image pixelcomparator component 310 is configured to estimate a value between thetwo adjacent hash marks 413. In accordance with various embodiments,image pixel comparator component 310 compares the number of image pixelsof image capture device 206 between horizontal crosshair 401 and thehash mark 413 directly below horizontal crosshair 401 with the number ofimage pixels of image capture device 206 above horizontal crosshair 401and the hash mark 413 directly above horizontal crosshair 401. Thus,electronic rod reader and field notebook logic component 220 canestimate a fraction measurement between adjacent hash marks 413 whichcan be used to further improve the precision of determining theelevation at the point at which standard grade rod 110 is located.

The blocks that represent features in FIG. 3 can be arranged differentlythan as illustrated, and can implement additional or fewer features thanwhat are described herein. Further, the features represented by theblocks in FIG. 3 can be combined in various ways. Electronic rod readerand field notebook logic component 220 can be implemented usingsoftware, hardware, hardware and software, hardware and firmware, or acombination thereof. Further, unless specified otherwise, variousembodiments that are described as being a part of the electronic rodreader and field notebook logic component 220, whether depicted as apart of the electronic rod reader and field notebook logic component 220or not, can be implemented using software, hardware, hardware andsoftware, hardware and firmware, software and firmware, or a combinationthereof. Various blocks in FIG. 3 refer to features that are logic, suchas but not limited to electronic rod reader and field notebook logiccomponent 220 can be implemented using software, hardware, hardware andsoftware, hardware and firmware, software and firmware, or a combinationthereof

FIG. 4 shows an image captured by an image capture device 206 of anelectronic rod reader and field notebook 120 in accordance with variousembodiments. As shown in FIG. 4, standard grade rod 110 is visiblethrough the eyepiece 102 of auto-level 101. As described above,horizontal crosshair 401 and vertical crosshair 402 are visible, as arefoot number 410 and inch numbers (e.g., 411 of FIG. 4). These aredisplayed on standard grade rod 110 to facilitate reading the elevationof the point at which standard grade rod 110 is located. As discussedabove, characters 412 are displayed on standard grade rod 110 tofacilitate determining what value is being displayed due to the narrowfield of view of auto-level 101. As discussed above, the type ofstandard grade rod 110 shown in FIG. 4 is a ⅛ inch rod. Thus, the widthof each hash mark 413, as well as the space between each hash mark 413,equals ⅛^(th) inch. However, it is noted that various embodiments areable to read other types of grade rods 110 such as, but not limited to,metric grade rods and 1/10^(th) foot rods as well.

FIG. 5 is a flowchart of a method 500 of automatically reading andrecording auto-level readings in accordance with various embodiments.Method 500 includes some procedures that, in various embodiments, arecarried out by one or more processors under the control of computerreadable and computer-executable instructions. In this fashion,procedures described herein and in conjunction with method 500 are, ormay be, implemented in an automated fashion using a computer, in variousembodiments. The computer readable and computer executable instructionscan reside in any non-transitory computer readable storage medium, suchas, for example, in data storage features such as a Digital VersatileDisk (DVD), a Compact Disk (CD), peripheral computer readable storagemedia which may be removable, Random Access Memory (RAM), Read OnlyMemory (ROM), and an internal or removably couplable storage device orthe like. The computer readable and computer-executable instructions,which reside on tangible, non-transitory computer readable storagemedia, are used to control or operate in conjunction with, for example,one or some combination of processor(s) 203, or other similarprocessor(s). Although specific procedures are disclosed in method 500,such procedures are examples. That is, embodiments are well suited toperforming various other procedures or variations of the proceduresrecited in method 500. Likewise, in some embodiments, the procedures inmethod 500 may be performed in an order different than presented and/ornot all of the procedures described may be performed. It is furtherappreciated that procedures described in method 500 may be implementedin hardware, or a combination of hardware with firmware and/or software.

In operation 510 of FIG. 5, an image is captured through the eyepiece ofan auto-level using an image capture device. In accordance with variousembodiments, a user can put the image capture device 206 of electronicrod reader and field notebook 120 up to the eyepiece 102 of auto-level101. In accordance with various embodiments, the user can use display208 to see what is being viewed by electronic rod reader and fieldnotebook 120 through the eyepiece 102 of electronic rod reader and fieldnotebook 120. In at least one embodiment, a user can make someindication, such as pressing display 208 to capture an image of what isbeing viewed through eyepiece 102 at that moment. In accordance withvarious embodiments, electronic rod reader and field notebook logiccomponent 220 is configured to access that image and to perform theoperations described above with reference to FIG. 3. It is noted thatthere is no necessity to capture an image of what is viewed througheyepiece 102 to perform the operations described above with reference toFIG. 3 in accordance with various embodiments. In accordance withvarious embodiments, this image, as well as other images, can becomepart of the file (e.g., first reading 250 of FIG. 2) stored in, forexample, memory 204 of the elevation readings performed by auto-level101. Additionally, position fixes from an electronic device located ator near standard grade rod 110 can be stored along with the image(s)captured by image capture device 206 as part of the file store in memory204. Other images from the electronic device located at or near standardgrade rod 110 can also be stored as part of the file which provideinformation such as the location of standard grade rod 110 relative tosome local reference point.

In operation 520 of FIG. 5, a crosshair viewed through the eyepiece ofsaid auto-level using is automatically recognized using logicimplemented by a processor a an electronic rod reader. As describedabove, crosshair recognition component 301 is configured to recognize atleast horizontal crosshair 401 via image capture device 206.

In operation 530 of FIG. 5, the crosshair is automatically comparedagainst a scale of a standard grade rod viewed through the eyepiece ofthe auto-level using the logic implemented by the processor of theelectronic rod reader. As described above with reference to FIG. 3,scale comparison component 303 compares the scale (e.g., foot numbers410, inch numbers 411, characters 412, and hash marks 413 of FIG. 4)displayed on standard grade rod 110 with horizontal crosshair 410 to“read” which hash mark is co-planar with horizontal crosshair 401.

In operation 540 of FIG. 5, an elevation of the standard grade rod isautomatically determined based upon the comparing of operation 530 usingthe logic implemented by the processor of the electronic rod reader. Asdescribed above, dimension identifier component 305 automaticallydetermines the value of the hash mark 413, or an estimation of a valuebetween adjacent hash marks 413, which is co-planar with horizontalcrosshair 401. Furthermore, this dimension is used by elevationdetermination component 307 to determine the elevation of the point atwhich standard grade rod 110 is located by adding the dimensiondetermined by dimension identifier component 305 with the elevation ofauto-level 101.

In operation 550 of FIG. 5, the elevation is automatically stored as afirst reading using a non-transitory computer readable data storagemedium coupled with the processor. In accordance with variousembodiments, electronic rod reader and field notebook 120 automaticallystores the elevation of the location at which standard grade rod 110 islocated (e.g., first reading 250 of FIG. 2) on a non-transitory computerreadable data storage medium. As discussed above, additional informationsuch as a position fix of the location at which standard grade rod 110is located can be automatically appended to the elevation informationfor that point. Additionally, images captured by electronic rod readerand field notebook 120 and/or electronic devices co-located withstandard grade rod 110 can be appended to the file (e.g., first reading250 of FIG. 2).

In accordance with various embodiments, electronic rod reader and fieldnotebook 120 comprises a portable electronic device which is notoriginally configured to be used as a surveying device, or to performthe operations described above with reference to FIGS. 3 and 5. In atleast one embodiment, electronic rod reader and field notebook 120comprises a cellular telephone. As described above, electronic rodreader and field notebook 120 comprises a wireless communication deviceconfigured for receiving a position (e.g., derived from a GNSS device)of standard grade rod 110 when an elevation reading is made inaccordance with various embodiments. This position information can beautomatically stored with the elevation reading to provide a morecomplete set of data. In accordance with various embodiments, the typeof scale (e.g., metric, 1/10^(th) foot, ⅛^(th) inch, etc.) can beautomatically determined electronic rod reader and field notebook logiccomponent 220. Alternatively, this information can be manually enteredby a user. Furthermore, electronic rod reader and field notebook logiccomponent 220 is configured to automatically recognize characters shownon standard grade rod 110 using character recognition component 309.Furthermore, electronic rod reader and field notebook logic component220 is capable of automatically recognizing they type of standard graderod 110 (e.g., metric, 1/10^(th) foot, ⅛^(th) inch, etc.) is beingviewed via auto-level 101. As discussed above, electronic rod reader andfield notebook logic component 220 comprises an image pixel comparatorcomponent 310 which is configured to estimate a value when horizontalcrosshair 401 is determined to lie between two adjacent hash marks 413.In accordance with various embodiments, electronic rod reader and fieldnotebook 120 can be used for other tasks than simply collectingelevations and position fixes. In accordance with at least oneembodiment, electronic rod reader and field notebook 120 can estimatethe volume of, for example, a mound of soil by taking successiveposition fixes and elevations. For example, a series of elevations andposition fixes can be taken which define a periphery of a mound of soil.Then, successive position fixes and elevations of the mound itself canbe made and an estimate of the volume of the mound of soil can beperformed using, for example, processor 203. In accordance with variousembodiments, the data collected by electronic rod reader and fieldnotebook 120 can be sent in real-time to a remote location such as anoffice using, for example, cellular transceiver 207, or Wi-Fitransceiver 209.

FIG. 6 is a cross-sectional view of an example auto-level in accordancewith various embodiments. In FIG. 6, auto-level 101 comprises aplurality of lenses (e.g., 601, 602, 603, 607, and 608) and prisms(e.g., 604, 605, and 606) of a telescope 609 which are used tomanipulate the light path of an image being viewed. It is noted that thelenses and prisms shown in FIG. 6 are meant to be understood asrepresentative rather than a literal representation of the arrangementof lenses and prisms in an auto-level. As shown in FIG. 6, and as is thecase in most standard auto-levels, prism 605 is suspended as a pendulumand is allowed to swing freely within auto-level 101. This permitsauto-level 101 to self-level to a certain degree and removes thenecessity to absolutely emplace auto-level 101 as truly level withrespect to the Earth's gravitational pull. As shown in FIG. 6 electronicrod reader and field notebook 120 is positioned behind eyepiece 102 in amanner to capture the image(s) viewed through eyepiece 102.

Integrated Auto-Level and Electronic Rod Reader

FIG. 7 is a cross-sectional view of an example auto-level in accordancewith various embodiments. In the embodiment of FIG. 7, eyepiece 102 hasbeen removed from auto-level 101 and has been replaced with an imagedelivery device 701. In accordance with various embodiments, imagedelivery device 701 is configured to capture an image through auto-level101 and to transmit that image, either via a wireless or wired dataconnection, to electronic rod reader and field notebook 120. In otherwords, rather than performing the processing of a captured image such asreading the scale of standard grade rod 110 and determining theelevation thereof, image delivery device 701 simply conveys the image it“sees” and captures through the telescope 609 of auto-level 101 andconveys that image to electronic rod reader and field notebook 120 whereadditional processing (e.g., automatically recognizing standard graderod 110, automatically comparing a crosshair against the scale ofstandard grade rod 110, automatically determining the elevation ofstandard grade rod 110, and automatically storing the elevation ofstandard grade rod 110) of the image takes place. It is noted that inFIG. 7, image delivery device 701 is integrated into auto-level 101. Inaccordance with at least one embodiment, all or a portion of theeyepiece (e.g., 102 of FIG. 1) of auto-level 101 can be removed (e.g.,unscrewed from auto-level 101) and image delivery device 701 can replaceall or a portion of eyepiece 102. In accordance with at least oneembodiment, image delivery device 701 is configured to correct the imagethrough telescope 609 to compensate for optical devices (e.g., lenses607 and 608 of FIG. 6) which may be removed when eyepiece 102 is removedfrom auto-level 101. Additionally, in accordance with at least oneembodiment, image delivery device 701 will overlay a crosshair (e.g.,401 of FIG. 4) onto the image. In so doing, the embodiment shown in FIG.7 integrates the capability to read standard grade rods within anauto-level without the necessity of purchasing expensive, purpose-built,electronic auto-levels which lack the capability of reading standardgrade rods. Furthermore, as will be discussed in greater detail below,one embodiment of image delivery device 701 comprises a display device(e.g., 1006 of FIG. 10) which permits a user to view what image isvisible through telescope 609 of auto-level 101, as opposed to manyauto-levels which have a device that only displays the elevations beingread from a barcode (e.g., computer-readable only) grade rod.

FIG. 8 is a cross-sectional view of an example auto-level in accordancewith various embodiments. In FIG. 8, rather than integrating imagedelivery device 701 into auto-level 101, it is attached to auto-level101 using brackets 801 and 802. In the embodiment shown in FIG. 8, imagedelivery device 701 is configured to capture an image through telescope609. Again, in accordance with at least one embodiment image deliverydevice 701 is configured to correct the image through telescope 609 tocompensate for optical devices (e.g., lenses 607 and 608 of FIG. 6)which are removed when eyepiece 102 is removed from auto-level 101. Asshown in FIG. 8, image delivery device 701 communicates with electronicrod reader and field notebook 120 using a wireless communication link.However, it is noted that in accordance with various embodiments imagedelivery device 701 can also implement a wired communication channelwith other devices including electronic rod reader and field notebook120. In accordance with various embodiments, having received the imagevisible through telescope 609, electronic rod reader and field notebook120 performs the processing of that image to determine the elevation ofstandard grade rod 110. In accordance with various embodiments, thisprocessing includes, but is not limited to, automatically recognizingstandard grade rod 110, automatically comparing a crosshair against thescale of standard grade rod 110, automatically determining the elevationof standard grade rod 110, and automatically storing the elevation ofstandard grade rod 110.

FIG. 9 depicts a block diagram of an example image delivery device 701in accordance with at least one embodiment. The image delivery device701 includes a bus 1001, a processor 1002 coupled with bus 1001 forprocessing information and instructions, a memory 1003 coupled with bus1001 for storing information and instructions for processor 1002. It isnoted that memory 1003 can comprise volatile memory and/or non-volatilememory, as well as removable data storage media in accordance withvarious embodiments.

In the embodiment shown in FIG. 9, image delivery device 701 furthercomprises an optional data storage device 1004. In accordance withvarious embodiments, data storage device 1004 comprises non-volatilestorage such as a RAM or ROM, or some other computer readable memorydevice or media such as a removable data storage device. Examples ofremovable data storage devices in accordance with various embodimentsinclude, but are not limited to, implementations of the CompactFlashformat of data storage devices, implementations of the SmartMedia formatof data storage devices, implementations of the SecureDigital format ofdata storage devices, and implementations of Universal Serial Bus (USB)format of data storage devices. In accordance with various embodiments,data storage device 1004 can be used to store images of standard graderod 110 until confirmation of receipt of those images is received fromanother device such as electronic rod reader and field notebook 120.

In FIG. 9, an image capture device 1005 is coupled with bus 1001.Examples of image capture device 1005 are a camera, a video camera, adigital camera, a digital video camera, a digital camcorder, a stereodigital camera, a stereo video camera, and a motion picture camera. Theimage capture device 1005 may use a lens or be a pinhole type device.

According to various embodiments, an optional wireless transceiver 1007is configured to permit communication with other devices such aselectronic rod reader and field notebook 120. In accordance with oneembodiment, wireless transceiver 1007 communicates with electronic rodreader and field notebook 120 via a cellular telephone network. Examplesof cellular networks used by wireless transceiver 1007 include, but arenot limited to: GSM cellular networks, GPRS cellular networks, CDMAcellular networks, and EDGE cellular networks. In accordance with atleast one embodiment, wireless transceiver 1007 is configured to operateon a satellite-based cellular network such as the Inmarsat or Iridiumcommunication networks. In accordance with various embodiments, optionalwireless transceiver 209 may be configured to operate on/in compliancewith any suitable wireless communication protocol including, but notlimited to: Wi-Fi, WiMAX, implementations of the IEEE 802.11specification, implementations of the IEEE 802.15.4 specification forpersonal area networks, and a short range wireless connection operatingin the Instrument Scientific and Medical (ISM) band of the radiofrequency spectrum in the 2400-2484 MHz range (e.g., implementations ofthe Bluetooth® standard).

In the embodiment of FIG. 9, image delivery device 701 further comprisesan optional display 1006. In accordance with various embodiments,display 1006 comprises a touch screen display using capacitive orresistive sensors to determine the location of an object touching thescreen and which can be interpreted as inputs for controlling operationsby processor 1002.

Image delivery device 701 also includes an optional data connector 1008for coupling image delivery device 701 with other devices such aselectronic rod reader and field notebook 120. For example, in oneembodiment data connector 1008 is a serial data port, or a parallel dataport, for enabling wired communications between external image deliverydevice 701 and electronic rod reader and field notebook 120. Morespecifically, in various embodiments, data connector 1008 can be used tocouple image delivery device 701 with electronic rod reader and fieldnotebook 120 for the exchange of data comprising an image(s) viewedthrough telescope 609 of auto-level 101.

The blocks that represent features in FIG. 9 can be arranged differentlythan as illustrated, and can implement additional or fewer features thanwhat are described herein. Further, the features represented by theblocks in FIG. 9 can be combined in various ways. Image delivery device701 can be implemented using software, hardware, hardware and software,hardware and firmware, or a combination thereof. Further, unlessspecified otherwise, various embodiments that are described as being apart of the image delivery device 701, whether depicted as a part of theimage delivery device 701 or not, can be implemented using software,hardware, hardware and software, hardware and firmware, software andfirmware, or a combination thereof.

FIG. 10 is a cross-sectional view of an example auto-level in accordancewith various embodiments. In the embodiment shown in FIG. 10, electronicrod reader and field notebook 120 is disposed within auto-level 101before an image reaches eyepiece 102. In accordance with at least oneembodiment, electronic rod reader and field notebook 120 will allowimages to pass through to eyepiece 102 to permit a user to manually aimand operate auto-level 101. However, when a user wants to read anelevation of standard grade rod 110, the user can, for example, initiateelectronic rod reader and field notebook 120 which causes it to divertthe image to image capture device 206. In accordance with oneembodiment, this is accomplished using an electronic shutter disposedwithin electronic rod reader and field notebook 120. For example, amirror and prism system may be utilized, in a similar manner to asingle-lens reflex (SLR) camera so that a user may view an image throughthe eyepiece 102 and the same image may then be diverted to imagecapture device 206 for capture of the image.

FIG. 11 is a flowchart of a method 1100 of automatically reading andrecording auto-level readings in accordance with various embodiments. Inoperation 1101 of FIG. 11, an image is captured through a telescope ofan auto-level using an image delivery device integrated with theauto-level. As discussed above, in accordance with various embodiments,an image is captured through the telescope (e.g., 609) of auto-level101. This includes, but is not limited to, using electronic rod readerand field notebook 120 to capture an image as shown in FIGS. 6 and 10.Alternatively, as shown in FIGS. 7 and 8, an image delivery device 701can be used to capture the image and convey it to another device (e.g.,a portable electronic device, cellular telephone, electronic rod readerand field notebook 120, etc.). In accordance with various embodiments,the image can be conveyed from image delivery device 701 to anotherdevice using a wired or wireless communication link (e.g., usingwireless transceiver 1007 of FIG. 10).

In operation 1102 of FIG. 11, a crosshair overlying the image isautomatically recognized using logic implemented by a processor. Asdescribed above, crosshair recognition component 301 is configured torecognize at least horizontal crosshair 401 via image capture device206. In accordance with various embodiments, the processor (e.g., 203 ofFIG. 2) can be separate from the device which captures the image (e.g.,image capture device 1005 of FIG. 10), or a component of the device(e.g., electronic rod reader and field notebook 120) comprising theimage capture device (e.g., 206 of FIG. 2). In accordance with at leastone embodiment, the crosshair 401 is overlaid the image throughtelescope 609 by image delivery device 701.

In operation 1103 of FIG. 11, the crosshair is automatically comparedagainst a scale of a standard grade rod captured in the image using thelogic implemented by the processor. As described above with reference toFIG. 3, scale comparison component 303 compares the scale (e.g., footnumbers 410, inch numbers 411, characters 412, and hash marks 413 ofFIG. 4) displayed on standard grade rod 110 with horizontal crosshair410 to “read” which hash mark is co-planar with horizontal crosshair401.

In operation 1104 of FIG. 11, an elevation of said standard grade rod isautomatically determined using the logic implemented by the processorbased upon the comparing. As described above, dimension identifiercomponent 305 automatically determines the value of the hash mark 413,or an estimation of a value between adjacent hash marks 413, which isco-planar with horizontal crosshair 401. Furthermore, this dimension isused by elevation determination component 307 to determine the elevationof the point at which standard grade rod 110 is located by adding thedimension determined by dimension identifier component 305 with theelevation of auto-level 101.

In operation 1105 of FIG. 11, the elevation is automatically storedusing a non-transitory computer readable data storage medium coupledwith the processor as a first reading. In accordance with variousembodiments, electronic rod reader and field notebook 120 automaticallystores the elevation of the location at which standard grade rod 110 islocated (e.g., first reading 250 of FIG. 2) on a non-transitory computerreadable data storage medium. As discussed above, additional informationsuch as a position fix of the location at which standard grade rod 110is located can be automatically appended to the elevation informationfor that point. Additionally, images captured by electronic rod readerand field notebook 120 and/or electronic devices co-located withstandard grade rod 110 can be appended to the file (e.g., first reading250 of FIG. 2).

In accordance with various embodiments, electronic rod reader and fieldnotebook 120 comprises a portable electronic device which is notoriginally configured to be used as a surveying device, or to performthe operations described above with reference to FIGS. 3 and 5. In atleast one embodiment, electronic rod reader and field notebook 120comprises a cellular telephone. As described above, electronic rodreader and field notebook 120 comprises a wireless communication deviceconfigured for receiving a position (e.g., derived from a GNSS device)of standard grade rod 110 when an elevation reading is made inaccordance with various embodiments. This position information can beautomatically stored with the elevation reading to provide a morecomplete set of data. In accordance with various embodiments, the typeof scale (e.g., metric, 1/10^(th) foot, ⅛^(th) inch, etc.) can beautomatically determined electronic rod reader and field notebook logiccomponent 220. Alternatively, this information can be manually enteredby a user. Furthermore, electronic rod reader and field notebook logiccomponent 220 is configured to automatically recognize characters shownon standard grade rod 110 using character recognition component 309.Furthermore, electronic rod reader and field notebook logic component220 is capable of automatically recognizing they type of standard graderod 110 (e.g., metric, 1/10^(th) foot, ⅛^(th) inch, etc.) is beingviewed via auto-level 101. As discussed above, electronic rod reader andfield notebook logic component 220 comprises an image pixel comparatorcomponent 310 which is configured to estimate a value when horizontalcrosshair 401 is determined to lie between two adjacent hash marks 413.In accordance with various embodiments, electronic rod reader and fieldnotebook 120 can be used for other tasks than simply collectingelevations and position fixes. In accordance with at least oneembodiment, electronic rod reader and field notebook 120 can estimatethe volume of, for example, a mound of soil by taking successiveposition fixes and elevations. For example, a series of elevations andposition fixes can be taken which define a periphery of a mound of soil.Then, successive position fixes and elevations of the mound itself canbe made and an estimate of the volume of the mound of soil can beperformed using, for example, processor 203. In accordance with variousembodiments, the data collected by electronic rod reader and fieldnotebook 120 can be sent in real-time to a remote location such as anoffice using, for example, cellular transceiver 207, or Wi-Fitransceiver 209.

CONCLUSION

Example embodiments of the subject matter are thus described. Althoughthe subject matter has been described in a language specific tostructural features and/or methodological acts, it is to be understoodthat the subject matter defined in the appended claims is notnecessarily limited to the specific features or acts described above.Rather, the specific features and acts described above are disclosed asexample forms of implementing the claims.

Various embodiments have been described in various combinations andillustrations. However, any two or more embodiments or features may becombined. Further, any embodiment or feature may be used separately fromany other embodiment or feature. Phrases, such as “an embodiment,” “oneembodiment,” among others, used herein, are not necessarily referring tothe same embodiment. Features, structures, or characteristics of anyembodiment may be combined in any suitable manner with one or more otherfeatures, structures, or characteristics.

1-27. (canceled)
 28. An auto-level telescope, comprising: a housing; oneor more lenses and a prism in the housing, wherein the lenses and theprism are configured to cooperatively generate an image for an eyepiece,the eyepiece configured to receive the generated image and to refractthe received image for observation by a user; and an image deliverydevice configured to receive the image, to generate a representation ofthe received image, and to transmit the representation of the receivedimage to an electronic field notebook comprising a receiver configuredto receive the representation.
 29. The auto-level telescope of claim 28,wherein the image delivery device is removably attached to the housing.30. The auto-level telescope of claim 29, wherein the image deliverydevice is attached to the housing with one or more brackets.
 31. Theauto-level telescope of claim 29, further comprising the eyepiece,wherein the eyepiece is removably attached to the housing.
 32. Theauto-level telescope of claim 31, wherein the image delivery device isconfigured to replace the eyepiece once the eyepiece is removed.
 33. Theauto-level telescope of claim 28, wherein the image delivery device isconfigured to modify the received image to compensate for an absence ofthe eyepiece when generating the representation of the received image.34. The auto-level telescope of claim 28, wherein the image deliverydevice is configured to modify the received image by overlaying acrosshair on the representation of the received image when generatingthe representation of the received image.
 35. The auto-level telescopeof claim 28, wherein the image delivery device is integrated into theauto-level telescope.
 36. The auto-level telescope of claim 28, furthercomprising a display configured to display an image for the user,wherein the displayed image represents the received image.
 37. Anauto-level telescope, comprising: a housing; one or more lenses and aprism in the housing, wherein the lenses and the prism are configured tocooperatively generate an image; an eyepiece configured to receive thegenerated image and to refract the received image for observation by auser; and an electronic field notebook comprising a receiver configuredto receive the refracted image.
 38. The auto-level telescope of claim37, wherein the electronic filed notebook is configured to automaticallydetermine an elevation of a grade rod based on alpha-numeric charactersrepresented in the refracted image.
 39. The auto-level telescope ofclaim 37, wherein the eyepiece is removably attached to the housing. 40.The auto-level telescope of claim 37, further comprising a displayconfigured to display an image for a user, wherein the displayed imagerepresents the received image.
 41. An auto-level telescope, comprising:a housing; one or more lenses and a prism in the housing, wherein thelenses and the prism are configured to cooperatively generate an image;an electronic field notebook configured to pass the generated image andto electronically process the generated image; and an eyepiececonfigured to receive the image passed passing through the electronicfield notebook and to refract the received image for observation by auser.
 42. The auto-level telescope of claim 41, wherein the electronicfiled notebook is configured to automatically determine an elevation ofa grade rod based on alpha-numeric characters represented in thegenerated image.
 43. The auto-level telescope of claim 41, wherein theeyepiece is removably attached to the housing.
 44. The auto-leveltelescope of claim 41, wherein the electronic field notebook isremovably attached to the housing.
 45. The auto-level telescope of claim41, wherein the electronic field notebook comprises: an image capturedevice configured to store a representation of the generated image; andan electronic shutter configured to selectively pass the generated imageto the eyepiece and to selectively pass the image to the image capturedevice.
 46. The auto-level telescope of claim 45, wherein the imagecapture device comprises a mirror and prism system configured to passthe generated image to the eyepiece and to pass the image to the imagecapture device.